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#version 150
uniform float qt_Opacity;
uniform float relativeSizeX;
uniform float relativeSizeY;
uniform float spread;
uniform vec4 color;
in vec2 qt_TexCoord0;
out vec4 fragColor;
float linearstep(float e0, float e1, float x)
{
return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
}
void main()
{
float alpha =
smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - qt_TexCoord0.x)) *
smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - qt_TexCoord0.y));
float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
fragColor = color * qt_Opacity * spreadMultiplier * spreadMultiplier;
}
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